Brainerd weather in September: Brainerd, Minnesota: normal highs, lows, rain and records for September
Brainerd in September has a normal high of 71°F and a normal low of 47°F, a daily mean of 59°F, falling from 76°F on the 1st to 64°F by the 30th. Measurable precipitation falls on 11 days in a normal September, 2.60 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 21°C and low of 8°C, 66 mm of precipitation in September.
- NOAA stationBrainerd Crow Wing County Airport
- Station IDUSW00094938
- Location46.40°N 94.13°W
- Elevation1,221 ft (372 m)
- Population14,400
- Jan 21° 0°
- Feb 27° 4°
- Mar 40° 18°
- Apr 55° 31°
- May 68° 43°
- Jun 77° 53°
- Jul 82° 58°
- Aug 79° 55°
- Sep 71° 47°
- Oct 56° 35°
- Nov 40° 22°
- Dec 26° 8°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Brainerd in September?
The normal high is 71°F and the normal low 47°F, for a daily mean of 58.7°F. September is 8.6°F cooler than August and 13.3°F warmer than October. September is the 4th warmest month of the year in Brainerd and the 5th wettest. Across the month the normal high falls 12°F, from 76°F on September 1 to 64°F on September 30. From one year to the next September's mean temperature typically moves about 2.9°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 56°F and 62°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 37%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 76°F | 52°F | 37% | 17% |
| September 8 | 74°F | 50°F | 37% | 16% |
| September 15 | 71°F | 47°F | 37% | 17% |
| September 22 | 68°F | 45°F | 37% | 17% |
| September 30 | 64°F | 42°F | 36% | 18% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 76°F | 52°F | 37% | 17% | 13 h 20 min |
| September 2 | 76°F | 52°F | 37% | 17% | 13 h 20 min |
| September 3 | 76°F | 51°F | 37% | 17% | 13 h 20 min |
| September 4 | 75°F | 51°F | 37% | 16% | 13 h 10 min |
| September 5 | 75°F | 51°F | 37% | 16% | 13 h 10 min |
| September 6 | 75°F | 50°F | 37% | 16% | 13 h 10 min |
| September 7 | 74°F | 50°F | 37% | 16% | 13 h |
| September 8 | 74°F | 50°F | 37% | 16% | 13 h |
| September 9 | 73°F | 49°F | 37% | 16% | 13 h |
| September 10 | 73°F | 49°F | 37% | 16% | 12 h 50 min |
| September 11 | 73°F | 49°F | 37% | 17% | 12 h 50 min |
| September 12 | 72°F | 48°F | 37% | 17% | 12 h 50 min |
| September 13 | 72°F | 48°F | 37% | 17% | 12 h 40 min |
| September 14 | 72°F | 48°F | 37% | 17% | 12 h 40 min |
| September 15 | 71°F | 47°F | 37% | 17% | 12 h 40 min |
| September 16 | 71°F | 47°F | 37% | 17% | 12 h 30 min |
| September 17 | 70°F | 47°F | 37% | 17% | 12 h 30 min |
| September 18 | 70°F | 46°F | 37% | 17% | 12 h 30 min |
| September 19 | 69°F | 46°F | 37% | 17% | 12 h 20 min |
| September 20 | 69°F | 45°F | 37% | 17% | 12 h 20 min |
| September 21 | 68°F | 45°F | 37% | 17% | 12 h 20 min |
| September 22 | 68°F | 45°F | 37% | 17% | 12 h 20 min |
| September 23 | 67°F | 44°F | 37% | 17% | 12 h 10 min |
| September 24 | 67°F | 44°F | 37% | 17% | 12 h 10 min |
| September 25 | 66°F | 43°F | 37% | 17% | 12 h 10 min |
| September 26 | 66°F | 43°F | 37% | 17% | 12 h |
| September 27 | 65°F | 43°F | 37% | 17% | 12 h |
| September 28 | 65°F | 42°F | 37% | 18% | 12 h |
| September 29 | 64°F | 42°F | 36% | 18% | 11 h 50 min |
| September 30 | 64°F | 42°F | 36% | 18% | 11 h 50 min |
- Normal high
- 71°FSeptember average
- Normal low
- 47°FSeptember average
- Precipitation
- 2.60 inmonth total
- Days with precipitation
- 110.01 inch or more
- Nights at 32°F or colder
- 2
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 16
- Days at 80°F or more
- 5
- Sunshine
- 73%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094938; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Brainerd in September?
On a given September day the chance of 0.01 inch or more is 37% on average, highest around September 1 (37%). In all, 2.60 in falls on 11 days of a normal September, 1 of them with an inch or more.
In a normal September in Brainerd, 2 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094938.
How humid and windy is Brainerd in September?
At 3 p.m. the normal temperature is 61°F with 51% relative humidity and a dew point of 43°F; at 6 a.m. it is 45°F with 84% humidity. The wind averages 7.6 mph, most often from the west-southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 45°F | 41°F | 84% | 5.8 mph | – |
| 9 a.m. | 52°F | 43°F | 72% | 8.5 mph | 62% |
| noon | 59°F | 43°F | 55% | 10.0 mph | – |
| 3 p.m. | 61°F | 43°F | 51% | 9.9 mph | 59% |
| 6 p.m. | 56°F | 44°F | 63% | 6.6 mph | 64% |
| 9 p.m. | 51°F | 43°F | 74% | 6.1 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094938. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Brainerd?
The warmest September temperature on Brainerd's official record (since 1898) is 103°F, on September 10, 1931; the coldest is 18°F, on September 22, 1974. The wettest September brought 8.04 in (1965); the snowiest, 2.0 inches (1942).
The September mean against the 1991-2020 normal of 58.7°F: 2021 62.3°F (+3.5), 2022 61.6°F (+2.9), 2023 64.8°F (+6.1), 2024 66.2°F (+7.5), 2025 62.3°F (+3.6), 2026 61.2°F (+2.5). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 62.3°F | +3.5°F | 3.29 in |
| 2022 | 61.6°F | +2.9°F | 2.00 in |
| 2023 | 64.8°F | +6.1°F | 4.19 in |
| 2024 | 66.2°F | +7.5°F | 0.68 in |
| 2025 | 62.3°F | +3.6°F | 2.43 in |
| 2026 | 61.2°F | +2.5°F | 3.06 in |
Source: records: ACIS, NWS threaded record BRDthr; recent months: ACIS, station USW00094938. Records and recent months use complete months only.
How does September in Brainerd compare across Minnesota?
Across the 129 places PlainClimate covers in Minnesota, September normal highs run from 62°F in Lutsen to 76°F in Milan; Brainerd's is 71°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.